From b609f06ac4ac77433035366e9aa4dcd7a0f743a0 Mon Sep 17 00:00:00 2001 From: Steve French Date: Mon, 9 Jul 2007 07:55:14 +0000 Subject: [PATCH] [CIFS] Fix packet signatures for NTLMv2 case Signed-off-by: Yehuda Sadeh Weinraub Signed-off-by: Steve French --- fs/cifs/CHANGES | 4 +++ fs/cifs/TODO | 6 ++--- fs/cifs/cifsencrypt.c | 63 +++++++++++++++++++++++++++---------------- fs/cifs/cifsglob.h | 14 +++++++++- fs/cifs/cifsproto.h | 8 +++--- fs/cifs/connect.c | 4 +-- fs/cifs/sess.c | 2 +- fs/cifs/transport.c | 6 ++--- 8 files changed, 71 insertions(+), 36 deletions(-) diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES index 258130eea9e..ee276f62bcf 100644 --- a/fs/cifs/CHANGES +++ b/fs/cifs/CHANGES @@ -1,3 +1,7 @@ +Version 1.50 +------------ +Fix NTLMv2 signing + Version 1.49 ------------ IPv6 support. Enable ipv6 addresses to be passed on mount (put the ipv6 diff --git a/fs/cifs/TODO b/fs/cifs/TODO index d57dc2917d0..d7bd51575fd 100644 --- a/fs/cifs/TODO +++ b/fs/cifs/TODO @@ -18,9 +18,9 @@ better) d) Kerberos/SPNEGO session setup support - (started) -e) More testing of NTLMv2 authentication (mostly implemented - double check -that NTLMv2 signing works, also need to cleanup now unneeded SessSetup code in -fs/cifs/connect.c) +e) Cleanup now unneeded SessSetup code in +fs/cifs/connect.c and add back in NTLMSSP code if any servers +need it f) MD5-HMAC signing SMB PDUs when SPNEGO style SessionSetup used (Kerberos or NTLMSSP). Signing alreadyimplemented for NTLM diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c index 8422df81b99..860dc49ba79 100644 --- a/fs/cifs/cifsencrypt.c +++ b/fs/cifs/cifsencrypt.c @@ -41,16 +41,17 @@ extern void SMBencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24); static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu, - const char *key, char *signature) + const struct mac_key *key, char *signature) { struct MD5Context context; - if ((cifs_pdu == NULL) || (signature == NULL)) + if ((cifs_pdu == NULL) || (signature == NULL) || (key == NULL)) return -EINVAL; MD5Init(&context); - MD5Update(&context, key, CIFS_SESS_KEY_SIZE+16); + MD5Update(&context, (char *)&key->data, key->len); MD5Update(&context, cifs_pdu->Protocol, cifs_pdu->smb_buf_length); + MD5Final(signature, &context); return 0; } @@ -76,7 +77,7 @@ int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, server->sequence_number++; spin_unlock(&GlobalMid_Lock); - rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key, + rc = cifs_calculate_signature(cifs_pdu, &server->mac_signing_key, smb_signature); if (rc) memset(cifs_pdu->Signature.SecuritySignature, 0, 8); @@ -87,16 +88,16 @@ int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, } static int cifs_calc_signature2(const struct kvec *iov, int n_vec, - const char *key, char *signature) + const struct mac_key *key, char *signature) { struct MD5Context context; int i; - if ((iov == NULL) || (signature == NULL)) + if ((iov == NULL) || (signature == NULL) || (key == NULL)) return -EINVAL; MD5Init(&context); - MD5Update(&context, key, CIFS_SESS_KEY_SIZE+16); + MD5Update(&context, (char *)&key->data, key->len); for (i=0;isequence_number++; spin_unlock(&GlobalMid_Lock); - rc = cifs_calc_signature2(iov, n_vec, server->mac_signing_key, + rc = cifs_calc_signature2(iov, n_vec, &server->mac_signing_key, smb_signature); if (rc) memset(cifs_pdu->Signature.SecuritySignature, 0, 8); @@ -151,7 +152,8 @@ int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server, return rc; } -int cifs_verify_signature(struct smb_hdr *cifs_pdu, const char *mac_key, +int cifs_verify_signature(struct smb_hdr *cifs_pdu, + const struct mac_key *mac_key, __u32 expected_sequence_number) { unsigned int rc; @@ -202,15 +204,17 @@ int cifs_verify_signature(struct smb_hdr *cifs_pdu, const char *mac_key, } /* We fill in key by putting in 40 byte array which was allocated by caller */ -int cifs_calculate_mac_key(char * key, const char * rn, const char * password) +int cifs_calculate_mac_key(struct mac_key *key, const char *rn, + const char *password) { char temp_key[16]; if ((key == NULL) || (rn == NULL)) return -EINVAL; E_md4hash(password, temp_key); - mdfour(key,temp_key,16); - memcpy(key+16,rn, CIFS_SESS_KEY_SIZE); + mdfour(key->data.ntlm, temp_key, 16); + memcpy(key->data.ntlm+16, rn, CIFS_SESS_KEY_SIZE); + key->len = 40; return 0; } @@ -235,35 +239,35 @@ int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, if(ses->domainName == NULL) return -EINVAL; /* BB should we use CIFS_LINUX_DOM */ dom_name_len = strlen(ses->domainName); - if(dom_name_len > MAX_USERNAME_SIZE) + if (dom_name_len > MAX_USERNAME_SIZE) return -EINVAL; ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL); - if(ucase_buf == NULL) + if (ucase_buf == NULL) return -ENOMEM; unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL); - if(unicode_buf == NULL) { + if (unicode_buf == NULL) { kfree(ucase_buf); return -ENOMEM; } - for(i=0;icharset2upper[(int)ses->userName[i]]; ucase_buf[i] = 0; user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info); unicode_buf[user_name_len] = 0; user_name_len++; - for(i=0;icharset2upper[(int)ses->domainName[i]]; ucase_buf[i] = 0; dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info); unicode_buf[user_name_len + dom_name_len] = 0; hmac_md5_update((const unsigned char *) unicode_buf, - (user_name_len+dom_name_len)*2,&ctx); + (user_name_len+dom_name_len)*2, &ctx); - hmac_md5_final(ses->server->mac_signing_key,&ctx); + hmac_md5_final(ses->server->ntlmv2_hash, &ctx); kfree(ucase_buf); kfree(unicode_buf); return 0; @@ -347,7 +351,10 @@ static int calc_ntlmv2_hash(struct cifsSesInfo *ses, if(domain == NULL) goto calc_exit_1; len = cifs_strtoUCS(domain, ses->domainName, len, nls_cp); - UniStrupr(domain); + /* the following line was removed since it didn't work well + with lower cased domain name that passed as an option. + Maybe converting the domain name earlier makes sense */ + /* UniStrupr(domain); */ hmac_md5_update((char *)domain, 2*len, pctxt); @@ -358,7 +365,7 @@ calc_exit_1: calc_exit_2: /* BB FIXME what about bytes 24 through 40 of the signing key? compare with the NTLM example */ - hmac_md5_final(ses->server->mac_signing_key, pctxt); + hmac_md5_final(ses->server->ntlmv2_hash, pctxt); return rc; } @@ -368,6 +375,7 @@ void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf, { int rc; struct ntlmv2_resp * buf = (struct ntlmv2_resp *)resp_buf; + struct HMACMD5Context context; buf->blob_signature = cpu_to_le32(0x00000101); buf->reserved = 0; @@ -384,6 +392,15 @@ void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf, if(rc) cERROR(1,("could not get v2 hash rc %d",rc)); CalcNTLMv2_response(ses, resp_buf); + + /* now calculate the MAC key for NTLMv2 */ + hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context); + hmac_md5_update(resp_buf, 16, &context); + hmac_md5_final(ses->server->mac_signing_key.data.ntlmv2.key, &context); + + memcpy(&ses->server->mac_signing_key.data.ntlmv2.resp, resp_buf, + sizeof(struct ntlmv2_resp)); + ses->server->mac_signing_key.len = 16 + sizeof(struct ntlmv2_resp); } void CalcNTLMv2_response(const struct cifsSesInfo * ses, char * v2_session_response) @@ -391,9 +408,9 @@ void CalcNTLMv2_response(const struct cifsSesInfo * ses, char * v2_session_respo struct HMACMD5Context context; /* rest of v2 struct already generated */ memcpy(v2_session_response + 8, ses->server->cryptKey,8); - hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context); + hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context); - hmac_md5_update(v2_session_response+8, + hmac_md5_update(v2_session_response+8, sizeof(struct ntlmv2_resp) - 8, &context); hmac_md5_final(v2_session_response,&context); diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index e16a2c47300..0a7813175a2 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -104,6 +104,17 @@ enum protocolEnum { /* Netbios frames protocol not supported at this time */ }; +struct mac_key { + unsigned int len; + union { + char ntlm[CIFS_SESS_KEY_SIZE + 16]; + struct { + char key[16]; + struct ntlmv2_resp resp; + } ntlmv2; + } data; +}; + /* ***************************************************************** * Except the CIFS PDUs themselves all the @@ -159,7 +170,8 @@ struct TCP_Server_Info { /* 16th byte of RFC1001 workstation name is always null */ char workstation_RFC1001_name[SERVER_NAME_LEN_WITH_NULL]; __u32 sequence_number; /* needed for CIFS PDU signature */ - char mac_signing_key[CIFS_SESS_KEY_SIZE + 16]; + struct mac_key mac_signing_key; + char ntlmv2_hash[16]; unsigned long lstrp; /* when we got last response from this server */ }; diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index 4a89f038af2..6a6e3f9f3f8 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -294,9 +294,11 @@ extern void tconInfoFree(struct cifsTconInfo *); extern int cifs_sign_smb(struct smb_hdr *, struct TCP_Server_Info *, __u32 *); extern int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *, __u32 *); -extern int cifs_verify_signature(struct smb_hdr *, const char *mac_key, - __u32 expected_sequence_number); -extern int cifs_calculate_mac_key(char *key, const char *rn, const char *pass); +extern int cifs_verify_signature(struct smb_hdr *, + const struct mac_key *mac_key, + __u32 expected_sequence_number); +extern int cifs_calculate_mac_key(struct mac_key *key, const char *rn, + const char *pass); extern int CalcNTLMv2_partial_mac_key(struct cifsSesInfo *, const struct nls_table *); extern void CalcNTLMv2_response(const struct cifsSesInfo *, char * ); diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 8f436ef2436..9b95d4637fc 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -3475,7 +3475,7 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo, if(first_time) cifs_calculate_mac_key( - pSesInfo->server->mac_signing_key, + &pSesInfo->server->mac_signing_key, ntlm_session_key, pSesInfo->password); } @@ -3495,7 +3495,7 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo, if(first_time) cifs_calculate_mac_key( - pSesInfo->server->mac_signing_key, + &pSesInfo->server->mac_signing_key, ntlm_session_key, pSesInfo->password); rc = CIFSSessSetup(xid, pSesInfo, diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c index b3f9d40d06d..f45c4730e92 100644 --- a/fs/cifs/sess.c +++ b/fs/cifs/sess.c @@ -419,7 +419,7 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time, if (first_time) /* should this be moved into common code with similar ntlmv2 path? */ - cifs_calculate_mac_key(ses->server->mac_signing_key, + cifs_calculate_mac_key(&ses->server->mac_signing_key, ntlm_session_key, ses->password); /* copy session key */ diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c index 01b589163bd..f9ebe70ecc4 100644 --- a/fs/cifs/transport.c +++ b/fs/cifs/transport.c @@ -559,7 +559,7 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, (ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))) { rc = cifs_verify_signature(midQ->resp_buf, - ses->server->mac_signing_key, + &ses->server->mac_signing_key, midQ->sequence_number+1); if (rc) { cERROR(1, ("Unexpected SMB signature")); @@ -738,7 +738,7 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses, (ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))) { rc = cifs_verify_signature(out_buf, - ses->server->mac_signing_key, + &ses->server->mac_signing_key, midQ->sequence_number+1); if (rc) { cERROR(1, ("Unexpected SMB signature")); @@ -982,7 +982,7 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, (ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))) { rc = cifs_verify_signature(out_buf, - ses->server->mac_signing_key, + &ses->server->mac_signing_key, midQ->sequence_number+1); if (rc) { cERROR(1, ("Unexpected SMB signature")); -- 2.41.1